琼东南盆地与甲烷渗漏有关的早期成岩作用和孔隙水化学组分异常

邬黛黛; 叶瑛; 吴能友; 蒋宏晨; 季珊珊; 董海良; 刘坚

琼东南盆地与甲烷渗漏有关的早期成岩作用和孔隙水化学组分异常

1.
中国科学院, 广州能源研究所, 中国科学院可再生能源与天然气水合物重点实验室, 广东, 广州, 510640;浙江大学, 地球科学系, 浙江, 杭州, 310027;中国科学院, 广州天然气水合物研究中心, 广东, 广州, 510640
2.
浙江大学, 地球科学系, 浙江, 杭州, 310027
3.
中国科学院, 广州能源研究所, 中国科学院可再生能源与天然气水合物重点实验室, 广东, 广州, 510640;中国科学院, 广州天然气水合物研究中心, 广东, 广州, 510640;国土资源部, 广州海洋地质调查局, 广东, 广州, 510075
4.
美国迈阿密大学, 地质系, 牛津, 45056
5.
国土资源部, 广州海洋地质调查局, 广东, 广州, 510075

基金项目: 中国科学院广州能源研究所所长创新基金项目资助(o807r71001);国家重点基础研究计划资助(2009CB219506);国家高技术研究发展计划“八六三”计划资助(2006AA09Z216)

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出版历程
- 收稿日期: 2008-01-24
- 修回日期: 2009-01-12

Early diagenesis records and chemical composition abnormalities in pore water for methane-seep in sediments from the southern Qiongdong Basin

1.
Key Laboratory of Renewable Energy and Gas Hydrate of Guangzhou Institute of Energy Conversion of Chinese Academy of Sciences, Guangzhou Energy Institute, Chinese Academy of Sciences, Guangzhou 510640, China;Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China;Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China
2.
Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China
3.
Key Laboratory of Renewable Energy and Gas Hydrate of Guangzhou Institute of Energy Conversion of Chinese Academy of Sciences, Guangzhou Energy Institute, Chinese Academy of Sciences, Guangzhou 510640, China;Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China;Guangzhou Marine Geological Survey Bureau, Ministry of Land and Natural Resources, Guangzhou 510075, China
4.
Department of Geology, Miami University, Oxford 45056, USA
5.
Guangzhou Marine Geological Survey Bureau, Ministry of Land and Natural Resources, Guangzhou 510075, China

摘要

摘要: X-射线衍射和扫描电镜观察表明,采自南海北部琼东南盆地的沉积物样品中有天然气水合物和甲烷渗漏指示意义的自生碳酸盐、硫酸盐和草莓状framboids黄铁矿,自生矿物组合和显微结构特征与冷泉沉积物类似,属微生物成因。沉积物孔隙水化学组分分析结果显示,随着埋藏深度加深,SO₄^2-,Ca²⁺,Mg²⁺和Sr²⁺浓度明显降低,Mg²⁺浓度与Ca²⁺浓度和Sr²⁺浓度与Ca²⁺浓度的比值急剧增加,这些地球化学特征与世界上天然气水合物产区的浅表层沉积物孔隙水中离子浓度异常吻合较好,暗示采样站位深部可能有油气或天然气水合物藏。
- 自生矿物 /
- 甲烷渗漏 /
- 早期成岩作用 /
- 琼东南盆地 /
- 天然气水合物
Abstract: Complicated authigenic minerals were identified by XRD and SEM in the study sediment samples from the southern Qiongdong Basin, the northern South China Sea, such as miscellaneous carbonate, sulphate and fram biodal pyrite, which consistently indicate the gas hydrate and methane seep to occur in the area.The assem blage and fabric features are similar to those being found in cold-seep sediments, which are thought to be related to microorganisms fueled by dissolved methane.Results of chemical composition analysis in the pore water of the sediment samples show that the concent rations of SO₄^2-, Ca²⁺, Mg²⁺ and Sr²⁺ decrease clearly, and the concentration ratios of Mg²⁺ to Ca²⁺ and Sr²⁺ to Ca²⁺ increase sharply as the depth increases.These geochemical character istics are similar to chemical composition abnormalities in the pore water of the shallow sediments where the gas hydrate occurs in the world.Those results strongly indicate that there should be gas hydrates or deep water oil (gas) reservoirs underneath.
- authigenic minerals /
- methane seep /
- early diagenesis /
- southern Qiongdong Basin /
- gas hydrate

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